patch 8.2.1987: MS-Windows: Win32.mak is no longer needed

Problem:    MS-Windows: Win32.mak is no longer needed.
Solution:   Do not include Win32.mak. (Jason McHugh, closes #7290)
diff --git a/src/version.c b/src/version.c
index b78e0b5..b031e63 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1987,
+/**/
     1986,
 /**/
     1985,